Yurii

Yurii Kovalchuk
Flutter Engineer

Email: [открыть контакты](см. выше в блоке «контактная информация»)
GitHub: github.com/yureckovalchuk

PROFESSIONAL SUMMARY
Flutter Engineer with over 2 years of experience in mobile development and project architecture. Specialized in building scalable applications using Clean Architecture
and BLoC . Experienced in the full application release lifecycle, native platform integrations, and utilizing Node.js Cloud Functions for Firebase-backed solutions.
Strong focus on background execution logic, custom UI components, and secure data handling.

TECHNICAL SKILLS
Core: Flutter (Mobile & Web), Dart, Clean Architecture, OOP.
State Management: BLoC (Cubit), Provider.
Native & System: Platform Channels (MethodChannel) for native Android/iOS implementations.
App Lifecycle & Publishing: Full management of App Store Connect & Google Play Console (signing, provisioning, store compliance).
Backend & Firebase: Node.js (Cloud Functions), Firebase Auth, Firestore, Cloud Storage, Push Notifications.
Networking: Dio/HTTP, REST API integration, Interceptors, WebSocket, MQTT.
Data Modeling: DTO design, Freezed, build_runner, Injectable/GetIt.
Local Storage: SQLite, shared_preferences, flutter_secure_storage.
Tools & CI/CD: Git, GitHub, TestFlight, Firebase Distribution.

WORK EXPERIENCE

Quanta

Description: Quanta is a cross-platform mobile application that provides secure user onboarding with document verification and identity validation features. The app
includes localized registration, third-party login support, profile management, and seamless backend integration.

Responsibilities and Contributions:

Fully implemented registration flow UI and user profile screen based on designer-provided layouts.
Developed Google and Apple Sign-In authentication:
Android: google_sign_in , sign_in_with_apple .
iOS: native Apple auth with platform-specific handling.
Implemented document verification module:
Step-by-step ID/photo capture flow.
Live camera integration with on-screen masking (cropping frame).
Background dimming effect during photo capture.
Capture of selfie with document and upload to backend.
Integrated profile API for sending ID verification data, fetching user info, and handling conditional UI.
Configured automatic routing and redirects based on auth/verification state.
Set up multilingual support with flutter_localizations and intl .
Managed backend communication using dio with interceptors, error handling, and token refresh.
Oversaw test builds for Android and iOS (configured signing & provisioning, deployed via TestFlight and Firebase Distribution).

Technologies Used: Flutter, Dart, BLoC, Dio, Camera, CustomPaint, Google/Apple Auth, Firebase Distribution.

Emergency Button | Flutter Safety App

Description: A cross-platform mobile application designed to provide rapid assistance in critical situations. With a single tap, the app automatically sends an
emergency message, shares GPS coordinates, and initiates a call to a predefined contact.

Responsibilities and Contributions:

Fully cross-platform implementation (Android/iOS) with state management using BLoC .
Integrated flutter_local_notifications for local alerts and built adaptive UI with accessibility support.
Geolocation and Tracking:
Real-time updates using geolocator , location , and background_locator_2 .
Android: WorkManager , ForegroundService , GPS intervals.
iOS: CLLocationManager with distance-based filters and background updates.
Battery optimization and minimized wake-up triggers.
Networking and Server Integration:
Support for custom endpoints via REST/JSON, MQTT, or WebSocket.
Secure transmission of coordinates and emergency status.
System APIs and Security:
SMS dispatch using telephony or sms_maintained .
 Automatic emergency call via platform channels ( tel: URI).
Permissions management using permission_handler and flutter_secure_storage .
Background Execution and System Integration:
Bypassing system restrictions like Doze Mode and App Standby using AlarmManager and BroadcastReceiver .
Compliance with iOS privacy restrictions via significant location change monitoring.
Customization and UX: Multi-language support using the intl package with runtime switching capability.

Technologies Used: Flutter, Dart, BLoC, MethodChannels, WorkManager, ForegroundService, GPS/LBS.

Lunafy | Sleep & Focus Sounds App

Flutter Developer | 2024 – Present

Description: A mobile application designed to improve sleep quality and enhance focus during work by playing a curated selection of ambient sounds and
soundscapes.

Responsibilities and Contributions:

Implemented robust audio playback with background execution using just_audio and just_audio_background .
Integrated audio_service for seamless lock screen media controls and system audio focus management.
Designed predictable state management using BLoC ( flutter_bloc ) and provider .
Structured application routing and deep linking using auto_route .
Managed dependency injection utilizing get_it for scalable architecture.
Developed immutable data models and handled JSON serialization using freezed and json_annotation .
Configured local data persistence for user preferences and saved sound mixes via shared_preferences .
Integrated structured logging using the logging package for easier debugging and crash tracing.

Technologies Used: Flutter, Dart, BLoC, just_audio, audio_service, auto_route, get_it, freezed.

EDUCATION

Odesa State University of Intellectual Technologies and Communication Master’s Degree | 2013 – 2019 | Odesa, Ukraine

LANGUAGES

English: Intermediate
Ukrainian: Native